Fuel-burner control



J. A. DOBLE.

FUEL BURNER CONTROL. APPLICATION FILED SEPT- 4. I917.

v 1 332, 6 l 5 Patented Mar. 2, 1920.

U 4 2; 31mm:

UVVENTOR 'Wa'tn e66 J fl. ,DOBLE 4 TTORA/EYS UNITED STATES PATENT OFFICE.

JOHN A. DOBLE, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR .TO DOBLE LABORATORIES, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

EUEL-TBURNER CONTROL.

To all whom it may concern:

Be it known that I, JOHN A. Donne, a citi-' zcn of the United States, and a resident of tions of boiler temperature or pressure or.

both to control the operation of the burner.

The invention possesses other advantageous features, some of which, with the foregoing, will be set forth at length in the following description, where I shall outline in fullthat form of the invention which I have selected for illustration in the drawings accompanying and forming partof the present specification. In said drawings I have shown one specific form of the apparatus of my invention, but it is to be understood that I do not limit myself to such form, since the invention, as expressed'in the succeeding claims, may be embodied in a plurality of forms. In the drawings '1 have shown the invention applied to a 1'0- tar burner for liquid fuel, but it is equally wel applicable to other types of burners.

Referrin to said drawings:

Figure 1 1s a diagrammatic representation.

of the control system embodying my invention.

pressure and temperature operated apparatus.

M invention is applicable to the control of uel burners used in connection with steam generators, to control the burner in accordance with conditions of temperature and pressure within the generator. In accordance with my invention I provide a unitary structure which-is operated by both temperature and pressure conditions to control the operation of the burner. Liquid fuelburnersare-often provided with electric motors which supply the necessary a1r Specification of Letters Patent.

Fig. 2 isa vertical section through the to complete the combustion of'the fuel and the apparatus of my invention operates not only to control the flow of fuel to the burner but to open and close the motor circuit in accordance with'variations in boiler condi tions. The invention is particudarly applicable to fuel burners used in connection With steam generators on steam-propelled vehicles, such as automobiles or motor trucks, but can be advantageously used in other environments where automatic control of boiler conditions is desirable.

The burner shown comprises a casing 2 in which is arranged a rotatable disk or cup 3 which is secured to the shaft of the motor 4. Secured to the shaft or to the under side of the cup is the blower 5, which induces the necessary air for combustion. A spark plug 6 arranged in the casing furnishes the necessary spark for igniting the combustible mixture. Fuel is fed to thecup 3 from the supply tank 7, through the conduit 8, in which is arranged a solenoid-operated valve 9 and a measuring pump 12 which is cared to the motor shaft.

ounted on some suitable structure adj acent the boiler, is a frame 13, on the opposite ends of which are arranged casin s 14-15 each containin a diaphragm 161 Bearing against the diaphragm 16 and extcnding'from the casing 14 is a rod or piston Patented Mar. 2, 1920. Application filed September 4, 1917. Serial No. 189,617.

18 and bearing against the diaphragm 17 I and extending from the casing 15 is arod or piston 19; These rods are alinedand are movable toward and away from each other. Engaging the projecting ends of the rods and bearing against the rods is a resilient flexible element 21, the fiexure or curvature of which varies with the longitudinal movement of the rods. Arranged at the center of the frame is an electrical contact 22 and arranged at the center of the element 21 and in position to contactwith the contact 22 is a second contact 28. These contacts are insulated respectively from the frame and the element, so that the electric circuit is closed only when the contacts are in engagement, and the bending of the ele- Arranged within the steam header is a sealed tube 26, partly filled withwater, so that the pressure within the tube varies with the temperature of the steam' in the header. The tube is connected to the chamber behind the diaphragm in casing 1 so that the pressure on the diaphragm 16 and consequently on the rod 18 is proportionate to the temperature of the steam. The rigidity of the element 21 is such that it is flexed sufliciently to open the circuit only when predetermined temperature or pressure conditions obtain in the boiler. The contacts 22 and 23 are preferably sliding contacts, disposed so that a relative move ment between them is possible to alimited extent without opening the circuit. The contacts are arranged in circuit with the storage battery 27 or other source of power and with the motor 4 and the valve-operat-' ing solenoid 9, so that when the contacts are separated the fuel line is closed and the motor circuit opened. High tension current for ignition is derived from the spark coil 28, the low tension side of which is connected to the motor circuit, so that the ignition is cut off when the contacts are separated.

I claim:

1. The combination with a heat absorbing medium containing apparatus, of a fuel burner associated therewith, an electric motor associated with said burner, a circuit for saidv motor, separable contacts in said circuit, a flexible element carrying one of said contacts and means actuated by variatlons in temperature and pressure in said apparatus for varying the flexure of said element.

2. The combination with a heat absorbtor associated with said burner, a circuit for said motor, separable contacts in said circuit, aflexible element carrying one of said contacts, movable abutments engaging the opposite ends of said element, and means for subjecting one of said abutments to the pressure insaid apparatus and the other abutment to a pressure corresponding to the temperature in said apparatus.

3. The combination with a heat absorbing medium containing ap aratus, of a fuel burner associated therewit an electric motor associated with said burner, a circuit for said motor, separable contacts in said circuit, a flexible element carrying one of said contacts, movable abutments engaging the opposite ends of said element, diatacts, opposed chambers on said frame, diaphragms in said chambers, one of said chambers being connected to the apparatus so that the pressure therein. corresponds to the pressure within the apparatus, the

other chamber being connected to the apparatus so that the pressure therein corresponds to the temperature in the apparatus,

movable abutments engaging said diaphragms, and a flexible element engaging said abutments and carrying the other of said contacts.

5. The combination with a heat absorbing medium containin apparatus, ofa fuel burner associated therewith, a conduit through which fuel "is fed to said burner, a valve in said conduit, a solenoid for opening and closing said valve, a circuit for said solenoid and means actuated by varia tions in temperature and pressure in said apparatus for opening and closing said circuit.

6. The combination with a heat absorbing medium containing apparatus, of'a rotary fuel burner associatedtherewith, an electric motor for driving said burner, a circuit for said motor and a device in said circuit actuated by variations in temperature and pressure in said apparatus for opening and closing. the circuit of the motor. I

7. The combination with a heat absorbing medium containing apparatus, of" an electrical device associated therewith, a circuit for said device, separable contacts in said circuit, a movable element carrying one of said contacts, and means actuated by variations in temperature and .pressurewithin said apparatus for moving said element to open and close the circuit.

In testimony whereof, I have hereunto set my hand at San Francisco, California, this 24th day of August 1917.

JOHN A. DOBLE.

- In presence of H. G. PRos'r. 

